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18 Cards in this Set
- Front
- Back
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What is the iris?
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The colored ring of muscle surrounding the pupil of the eye
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What is the cornea?
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A transparent tissue covering the iris and the pupil
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What is the pupil?
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The dark, transparent region in the center of the eye where light enters
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What is the sclera?
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An opaque tissue surrounding the cornea; visible as the white part of the eye surrounding the iris
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What is the retina?
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The inner lining of the back of the eye containing light sensitive rods and cones that convert light images into electrical signals for interpretation by the brain
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What is the optic nerve?
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The nerve that connects the eye to the brain
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Which part of the eye does the most focusing?
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The cornea and the lens
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What is a blind spot?
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Place on the retina where the optic nerve is attached and which cannot detect light because of its absence of both rod and cone cells
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What are rod cells?
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Cylinder shaped cells, located in the retina, that absorb light; they allow us to see images in shades of light and dark when the light is dim
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What are cone cells?
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Cone-shaped cells located in the retina that absorb light; they allow us to see color in bright light
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What is near-sighted?
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A focusing problem in which nearby objects are clear but distant objects are blurred; the rays converge before it hits the retina
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What is far-sighted?
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A focusing problem in which distant objects are clear but nearby objects are blurred; the rays converge after it hits the retina
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What do near-sighted people do to correct their vision and how does it help?
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They use a concave lens (in their glasses) to diverge the rays
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What do far-sighted people do to correct their vision and how does it help?
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They use a convex lens (in their glasses) to converge the rays
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What is astigmatism?
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Blurred vision caused by an irregularly shaped cornea
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What is internal reflection?
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Where no light escapes; all light is reflected back into it (optical fiber)
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What are optic fibers?
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Transparent glass fibers that can transmit light from one place to another
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What does laser stand for?
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Light amplification by stimulated emission radiation
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